Quote:
Originally Posted by ChikinTrucka
Not sure if it's already been asked or what forum to use, but here it goes...
What fuel mileage are you getting from what truck? Engine? Gears? Trans? Etc?
I drive a 2005 Mack Vision and get between 4.5 and 5.5 MPG, mostly at 1800 RPM +/- and 70 MPH.
I know that really stinks and I'm wondering what truck/engine/trany/rears are the best combo for the best mileage.
Someone recently told me his 2006 Freightshaker gets 6 to 7.5 but he must keep the RPM's at 1650 to do it.
Thanks.
2004 International 9400 with a wind deflector on the roof .. pulling 53" dry van. I have a 475 hp CAT with 1,650 lb/ft torque, 13 speed tranny with 0.73 top gear ratio, and 3.73 rears. I recently switched to low profile tires and I dropped a mile on the speedometer at the same RPM. I get decent fuel mileage (between 6 and 7 mpg) even fully loaded but only because I stay within the engine recommended RPMs. For my CAT, it's 1,300 to 1,400 RPM. I usually do 58 mph with a light load (1,300 rpm) and 60 mph with heavy load in hilly terrain (1,350 rpm).
1,800 rpm sounds too high even for a Mack engine... I'd suggest you found out your engine best RPM range, and maintain the road speed that puts you in that RPMs. You might need to get creative with axle ratios, tires (tall rubber will help you drive faster at better MPG), tranny top gear ratio, etc. But driving outside of your engine favorite "spot" is a sure way to waste tons of dough on diesel.